This book is a compilation of essays related to the disposal of highly radioactive nuclear waste materials at the projected disposal facility at Yucca Mountain in Nevada. The contributors agree with an international consensus that geological disposal of spent nuclear fuel and high-level nuclear waste is the best path to take. They present a brief history of the proposed facility and some of the problems faced in licensing. They also discuss the considerations that planners will have to take when designing the facility, which is meant to last for tens or even hundreds of thousands of years. The essayists discuss geology, hydrology, volcanism, and climate change. In addition, they relate the problems associated with waste packaging, zircaloy cladding, and the different types of waste forms, including glass and ceramic, to be disposed in the facility. The authors also suggest ways to improve nuclear waste disposal policies and practices. The collection is meant to make scientific concepts available to a general readership and to encourage informed decision-making.